ontains 15% niacinamide. There are a very few brands that offer the niacinamide percentage this high. This was my first time using concentrated niacinamide. I thought my skin would breakout or purge very badly but I gave it a go anyway. It has a transparent jelly-like consistency. After cleansing my face, I mix two drops of this serum with my essences. I got a very deep tan after my last vaccination and I think my tan is fading away quickly than I expected. My complexion is also getting softer, more “translucent” if you know what I mean. It didn’t break me out at all. My rating: ⭐️⭐️⭐️⭐️⭐️/5

I used this product every other day so as to ease it into my routine. I already use 10% niacinamide in my routine so my skin was used to a high percentage niacinamide. I did not find this product to be irritating in any way. I noticed that with consistent use, the product helped with pore reduction- although very minimally. It also helped to control excessive sebum. However, I have not noticed any brightening using this product. I always focus on the antioxidant effects of niacinamide in my routine as opposed to its other benefits like brightening and acne care. This product at 15% gives a great antioxidant kick. I love it!

First apply , it’s a little harsh maybe because of first try . I try it like a weeks now and it’s does help my acne pigmentation and gives my skin bright.

Product Claim: Cares all about acne & Effectively controls excess sebum and tightens Pores Main Ingredient: Niacinamide 15% My experience: I am very nervous and surprised that this serum contains 15% of Niacinamideand to be honest I am very afraid to use it at first because my skin is not in good condition. But for sure i am still trying it on my skin and it kinda Dries out my skin and i don’t like this serum at all. I think this serum is more for oily skin not the dry skin type like me.

Its an amazing ingredient to be added in my routine,it shrinks my pores and provide a firmer looking skin

I had really hoped this would control my oily t-zone, but sadly it doesn't. I also REALLY dislike the way it smells. It smells like nail polish, nail polish remover or something like that. I still love COSRX, but this product isn't for me.

I’ve used this serum every other day for about a month, and noticed a dramatic reduction in the pores on my nose as well as less breakouts. I’ll likely be purchasing this when I run out!

It gives a slight tingling feeling, not harsh or painful on the skin but I don’t know if this is normal. If anyone has tried this serum, has it been the same for you? It's lightweight, non tacky, and absorbs quickly though I think I prefer my 10% level of niacinamide. Once I’m ready to increase the concentration level, I would go back to this.

this was my first time trying out this product and I was pleasantly surprised. I currently don't have excessive breakouts to deal with because I have been on medication to treat cystic acne BUT I still have to deal with large pores and blackheads. I have found that this serum made my skin feel hydrated while keeping sebum production to a minimum. it made my skin feel less oily in my T zone which is my usual problem area. I felt like this serum helped balance out the moisture in my skin and made my last skin care step work better than before. I am currently not pairing this serum with any other cosrx products but the ones I have used from Pyunkang, Neogen, TheLab and Rovectin has paired well with this serum. I am definitely going to repurchase again but I wish it was offered in a slightly larger size because this bottle is really small. I wish it was at 30-40ml instead of 20ml.

It is one of my favourite serum from COSRX. It definitely works, i see results. My skin looks fresh and younger. Use it morning skin care routine.

It has a thinner consistency compared to other potent Niacinamide serums. Also more hydrating, not stripping. It really does help with oil control throughout the day! I wear makeup daily & mornings are hot! I have actually SEEN a difference when I use this as my skincare base in the AM! Sebum is controlled while not feeling dry & consistently using has visibly helped skin texture! Combo with Acetyl Glucosamine!

This serum comes in a 20 ml black glass bottle, the same design of the hyaluronic acid serum. I was a bit scared with this one because contains 15% of niacinamide, this is the highest porcentaje I’ve used but I didn’t experience any irritation or breakouts while using this. This also contains Acetyl Glucosamine that has anti-wrinkles and anti-pigmentation properties and Zinc that helps with the sebum production. The consistency is viscous, absorbs fast and is slightly sticky but after some minutes the sticky feeling disappears, it also gives a beautiful glowy finish. My skin is GLOWING everytime I use this and I honestly love it, overall this is my favorite out of the three.

It is a great serum don't get me wrong.However, I do believe everyone's skin reacts differently to different skin products. Though I noticed my pores have shrunk and blemishes have decreased when using, I've noticed an unbearable sting when I apply this directly after my toner. I am unsure if it is just the high concentrate or my skin is that sensitive. It is great working over all in light of all of it as my skin is less oily and brighter and it is great to layer and fast absorbing. The best way I've resolved this issue though is to apply the hyaluronic acid serum first prior to the other two serums it alleviates it tremendously.

The niacinamide 15 serum : this serum is great for minimizing pores and controlling sebum, I am using it and it has changed my skin a lot, its texture disappears once it dries

COSRX The Niacinamide 15 Serum 20ml This serum has a light texture and absorbs quickly. it can brighten the skin, besides that my skin feels smoother. This product can also relieve my redness

Textura ligera y acuosa, rápida absorción, al principio senti un poco de hormigueo pero con el uso se desvaneció la sensación, pero nunca fue irritante, es la primera vez que uso una concentración tan alta de Niacidamida, siempre he usado entre el 3% y 10%. He sufrido de un pequeño brote que me dejo algunas marcas y en la semana que lo utilice pude ver reducción en la producción de sebo y una ligera atenuación de las marcas (que ya se habían atenuado la semana anterior con el sérum COSRX Vitamina C 23%), con el uso de al menos 1 mes se deberán ver mejores resultados en cuanto a manchas y en apariencia de poros. Probado en tipo de piel: Mixta con tendencia a grasa. Recompraría, me gusto bastante, ya quiero ver lo que puede hacer por mis poros con el uso constante.

I have had oily skin all of my life and have always been looking for something that could get my oil in check and this serum has finally done that for me. I feel like with this serum that my skin has gone from oily to combination which is HUGE for me. Especially right now during the summer months. COSRX did it with this serum! I 100% recommend this to anybody with oily or acne prone skin. You need this!

This serum combines a high concentration of niacinamide with optimal ratios of synergistic ingredients for total acne care. While still adding brightening properties to the skin, it has impressive impacts on acne. Cosrx developed a "total care serum" that combines the maximum concentration of 15% niacinamide combined with optimal ratios of synergistic ingredients that will target acne from start to finish. Review: Agreed! This high niacinamide concentration serum does what it says! I always knew of niacinamide for its brightening properties, so I was very interested in how it would impact my ongoing mature acne. I have to say that it has helped! The serum has little to no scent and absorbs very well. I have to add... Finally, a bottle that won't tip over! It's hard enough with a dropper, serum, not losing the serum when putting the dropper back, or knocking over the bottle entirely, etc. Thank you Cosrx for understanding this!

Besides brightening hyperpigmentation, Niacinamide is also an effective ingredient for ance care. This Serum is formulated with 15% of Niacinamide, Acetyl Glucosamine, and Zinc PCA that works together to target all stages of acne, control excess sebum, and minimize pores. My skin has been exposed to dirt these few days. I’m surprised that I only got 1 new pimple on my forehead. I love how fast it absorbs into the skin without leaving stickiness.

My skin is more dry than oily but I have always had trouble with huge crater size pores! This has helped quite a bit on making them look smaller and helping my foundation not settle into each and every one.

Even i have only use this for a week, i can say that this serum works really well in calming down redness, and although it contains 15% of niacinamide its surprisingly gentle, it didn't cause any irritation or dry ski . Also ithelpsin reducing the oil production in my T zone. My skin love this niacinamide, it leave my skin more hydrated and dewy. I'm looking foward to continuing improvements.

I was pleasantly surprised when I tried this serum because past products containing niacinamide had caused my skin to break out. Since I have dry, dehydrated, and acne-prone skin, I stop using a product as soon as it causes me to break out. However, this serum helped a lot, and even when I did get new breakouts, they went away within a few days. Try this out!!! <3

Made with a high concentration of 15% nicacinamide, acetyl glucosamine, and zinc PCA, this product provides total acne care from start to finish, controls sebum and oil while minimizing the appearance of pores, and smooths rough skin through chemical exfoliation. When I first started this, my pores became huge (but we also went over 24 hours at the lake without running water and so skincare sat on the back burner and I skipped a day). After a few days of using this every night, the appearance of my pores began to minimize and I found that my skin was smoother with sebum and oil better controlled. I haven't been using this long enough to see any acne benefits, but I am premenstrual right now and have noticed very little acne.

15% Niacinamide, Acetyl Glucosamine, Zinc PCA, Allantoin Not too sure why CosRx went so hard on these percentages but man 15% was a little intense. This one didn’t suit my skin and caused some breakouts. I tried to target this on my t-zone only but it just didn’t work well for me. I think this might be better suited for oily-resilient skin. The serum is actually quite pleasant in texture, especially for something based on niacinamide. It is intended to exfoliate the skin & soothe acne.

It has a light in texture making it very easily absorbed without greasy feeling and unscent.A nice serum that helps keep the skin hydrated when used under a moisturizer. I use this in the morning mix it with vitamin c and it really plumps up my skin. There's no distinct scent and I think it would work well on all skin types,including sensitive skin.

NIACINAMIDE 15 #AcneDermSerum Targeted towards acne care, sebum & oil control. Also provides exfoliating properties & smoothens the skin. Cosrx formulated this with the maximum concentration of 15% which I thought was not possible. From what I heard, we only need 5-10% of Niacinamide. I’m not complaining tho bc even with this conc, this did not cause any stinging or irritation. My previous one was 10% and would occasionally cause stinging & pilling. Happy that this serum layers and absorbs well. Even tho Niacinamide is known for it’s brightening benefits, I typically use Niacinamide to address congestion on my chin and prevent maskne. Hassle free application & my skin actually feels smoother. This is my fave out of these 3 serums!

I don't suffer with acne but I do have combo skin with an oily tzone which is what I mainly use niacin for. It has a toner like texture with a slippery slip feeling when you apply it. It dries down almost instantly so I find it applies better with a roller than my hands. It helps reduce the excess oil my skin produces but it leaves behind a residue I don't like so I've been using it at night.⁣

#yeppuji Experience

It's my first time using a niacinamide serum with a high percentage, so I was a bit nervous. I patched tested for two days to ensure I wasn't getting any reactions. Surprisingly, I didn't get any, so I was safe to use it. I use the serum in my AM and PM routine to see its full effect. The serum looks and feels thick; however, it penetrates and absorbs quickly into the skin. As a result, my t-zone area where I have oils looks more balanced the next morning and throughout the day. It also does a great job of tightening my pores in the butterfly area and brightening my skin. I'm super please and looking forward to the results after I finish the bottle. I received this product for free from @cosrx and @stylekorean_global for an honest review.

This serum helps to minimise pores and sebum and control oil..Thid is perfect for summers..It has an oily texture and easily absorbs onto skin..